To be fair, the address support on Cash App IS hit or miss; what may work without a hitch for some may either have issues, or not work at all.
I'm assuming CR45H is in one of the latter camps, but I ...
I’m fairly certain your first paragraph is exactly why it doesn’t work. If they try to send my reward to my wallet and it fails, I lose those sats and that seems like what they’re trying to avoid by only allowing reliable addresses.
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